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tkBacktracer is a software tool that provides an interactive graphical user interface to display the movement of tools in an RS-274D "G-code" CNC file. It is written in TCL/Tk script.

Trebuchet Tk is a TCL/Tk based cross-platform graphical user interface (GUI) MUD client that offers exceptional functionality and flexibility. It is designed to allow gamers to play multiple MUDs on multiple platforms.

Fuzzball MUCK is a MUD server that is built upon tinyMuck with enhanced features. It is a powerful and advanced system suitable for creating a vast virtual world with an immersive gaming experience.